When we ran a full service chassis fab/turn-key hot rod shop a number of years ago, it was always useful to have threaded things around to weld into the frame for some kind of mount, etc.
Here’s a list of all our threaded things for your reference:
Aluminum Block for Lower Coilover Mount
Product Details
Brand: Welder Series
MPN: 212224
Bolt-on coilover mount for use with #27801 axle brackets.